@article{10_4064_cm_12_2_209_211,
     author = {S. Franklin},
     title = {Open and image-open relations},
     journal = {Colloquium Mathematicum},
     pages = {209--211},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1964},
     doi = {10.4064/cm-12-2-209-211},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-12-2-209-211/}
}